‘Siri, how do you remove nipples?’ A guide to freaking people out using an iPhone

You’re always at hand to help locate your bus stop, tell you when to buy your mum’s birthday present, and offer sterling advice about the best Chinese restaurants in your locale.

But speaking loudly to her in public (and yes, it’s a her – we checked with Siri) can often be somewhat embarrassing… especially if the questions you ask revolve around nipples, tampons and, erm, anal leakage.

American prankster John Vale wanted to see just how far he could push the affable talking phone service… and how many passers-by he could freak out.